多孔Ag@Ni泡沫金属的制备及其在非水性锂空气电池上的应用

发布时间：2018-05-26 19:11

本文选题：置换反应 + 集流体　；参考：《稀有金属材料与工程》2014年10期

【摘要】：通过改进的置换反应,以三维网状结构泡沫镍为基底,制备了新型多孔Ag/Ni复合泡沫金属材料(Ag@Ni泡沫金属)。X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线能谱(EDS)表明,泡沫镍基底上生成的金属Ag颗粒呈枝晶状且分布均匀。将其作为集流体首次应用于锂空气一次电池正极,通过线性伏安扫描(LSV)、电化学阻抗(EIS)和充放电测试研究了电极的电化学性能,结果表明,这种Ag@Ni泡沫金属作为锂空气一次电池的氧气极集流体,明显提高了还原反应的催化活性,改善了电化学反应性能,电流密度0.1 mA/cm2时,放电电压平台从2.66升高到2.73 V,容量也由2000 mAh/g增大到2750 mAh/g,且大电流密度下改善更为明显。
[Abstract]:A new porous Ag/Ni foamed metal material, Ag/Ni foamed metal, was prepared by modified displacement reaction. The results of SEM and EDS showed that the porous Ag/Ni composite metal foamed metal was prepared by X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy (EDS). The Ag particles formed on the foamed nickel substrate are dendritic and uniformly distributed. The electrode was used as a collector for the first time in lithium-air primary battery. The electrochemical performance of the electrode was studied by linear voltammetry scanning, electrochemical impedance spectroscopy (EIS) and charge-discharge test. The Ag@Ni foam metal was used as the oxygen collector of the lithium air primary battery. The catalytic activity of the reduction reaction was obviously improved, and the electrochemical reaction performance was improved. When the current density was 0.1 mA/cm2, the catalytic activity of the reduction reaction was improved. The discharge voltage platform increased from 2.66 to 2.73 V and the capacity also increased from 2000 mAh/g to 2750 mg / g, and the improvement was more obvious at high current density.
【作者单位】：四川大学;
【基金】：中物院-川大协同创新联合基金(0082604132222)
【分类号】：TM911.41;TB383.4

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